RetroArch - RetroArch is a frontend for emulators, game engines and media players.
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Batocera.linux - Batocera.linux is an open-source and completely free retro-gaming distribution that can be copied to a USB stick or an SD card with the aim of turning any computer/nano computer into a gaming console during a game or permanently.
ioBroker - flexible and modular application for the IoT and Smarthome
Playnite - Source code generated using layoutit.com
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation